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Questions tagged [inductive]

In the context of electronics, inductive refers to circuits that use magnetic fields, for things such as power or data transfer or sensing metal objects

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cooktop touch buttons foam [on hold]

I have recently replaced the top glass of my induction cooktop, but some of the touch buttons don't work. When i removed the broken glass, some foam pieces came along with the glass. These pieces sit ...
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How to safely switch a big inductive load with a Triac using a capacitor snubber?

I am building a Spot Welder with a big powerful transformer. I have to switch a big inductive load of 70mH (input of a transformer) The switching will be done with an SSR (Opto Triac Zero crossing SSR-...
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36 views

WPT compensation topologies

I'm experimenting with compensation topologies for inductive WPT systems and have a small confusion. The general WPT industry uses compensation networks to cancel out reactive components in the ...
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35 views

Why does the receiver coil voltage of this WPT circuit decrease at varying rates as the distance between the transmitter and receiver coil changes

The circuit below is a circuit that wirelessly transfers power via inductive coupling. I used a digital oscilloscope and measured the output voltage of the receiver coil at varying distances between ...
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Why does the voltage induced in the receiver coil of this WPT circuit decrease when a load is added (in parallel)?

The following is a circuit that wirelessly transfers power via inductive coupling. The circuit is supposed to power a 12 V 0.15 A DC fan and a typical smartphone, which requires 5 V DC across it. The ...
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74 views

What's causing the audible 7/8th rhythm in Qi chargers?

I have a wireless Qi charging system for my mobile phone. When I put the phone into the cradle it starts getting charged and I can hear a very quiet noise coming from the arrangement. Other ...
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28 views

Inductive loading in ADSL lines?

I have read that a significant drawback of telephone lines, one that makes difficult fast digital data transmission is the fact that they are inductively loaded. Now in telephone ADSL lines, are these ...
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2answers
171 views

IGBT destroyed. Help me identify any potential problems

I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate. ...
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Inductive spikes and noise in a hand prosthesis circuit

I am designing a circuit for a hand prosthesis. The main part of it is as follows (connections via pcb): Since it is meant to be as robust as possible, while keeping it low-cost and affordable (thus ...
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43 views

Minimal components for lighting an LED via wireless power transfer

I understand the basic concept of wireless power transfer. I wanted to make some wireless LEDs (Similar to this concept) and was trying to figure out the minimum component count I required in order ...
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29 views

How does electromagnetism factor into inductively coupled RFID systems

LF and HF RFID systems use inductive coupling to supply the tag with power. UHF RFID systems use antennas to send electromagnetic waves, the power supplied to the tag comes from the transmitted ...
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128 views

Controlling the Spark plug using 555 IC

I built the circuit for ignition system using MOSFET, 555, ignition coil(specs unknown. But current rating is more than 2 A and less than 10 A), SMPS(12 V, 10 A for powering the the whole circuit). ...
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105 views

Protecting a power supply from inductive load

I recently got a PeakTech 6225A power supply for my hobby of making/"tinkering"/messing around. I get many parts that I want power separately to diagnose them. I also get a lot of electromotors and ...
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36 views

How to spec out a relay correctly

I have a load that I am trying to switch with a relay. The load to the relay is an autotransformer. The wiper output of the autotransformer is (2) 120:30 step down transformers with each having 150W ...
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1answer
44 views

Inductive Charging 2 layer coil transfer to 1 layer receiver. Any issues?

I am looking to incorporate a inductive charging mechanism into a project I’m working on. On the receiving side I only have room for a single layer coil design. For my transfer side I have more ...
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2answers
143 views

Can every voltage source accept fly-back diode's current?

A diode is used parallel to the motor (or inductive load) in order to prevent damage to the switch because of back-emf voltage. Now, that back-emf voltage actually produces a current and by using a ...
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49 views

Inductive proximity sensor and target design

I am thinking of using the LDC1612 by TI to sense position over a 0 to 10mm range with an accuracy better than 100nm. I have been told this is possible by a TI engineer. However, my question concerns ...
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110 views

T.I H-Bridge design with No protection diodes?

I am still on my struggle trying to design my own Brushed DC H-bridge with all N-MOS, still in the research stage and burning mosfets left and right. I have come across this T.I design ,relatively ...
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445 views

arduino controlled spark plug with ignition coil

I am trying to built a ignition system which will have the following Spark plug Ignition coil (I don't know the spec of these. but this one is from Honda Activa) Some switching circuit I found ...
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72 views

DC/DC step-down regulator destruction because of inductive load?

I was evaluating PAM2316 DC/DC step-down converter and destroyed several of them, I suppose the cause could be an inductive load. See my schematic and my layout here: Let me explain: The circuit was ...
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3answers
648 views

Npn transistor failed to work

Sometimes after long time working correctly and turning on and off inductive load, Darlington NPN transistor (ONSEMI BD679) which should follow signal (IN4), fails to work and turns on inductive load ...
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1answer
26 views

How do I find the power factor and the equivalent inductivity value for this given scheme?

My exam is in 2 days and I just can't figure this thing out. I have the following scheme: First I was asked to find out the impedance, resistance and reactance of the dipole given below. This is what ...
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1answer
60 views

Circuit for detecting signal inversion

I am using two inductors on both sides of an ac carrying straight wire and want to detect their proximity from the wire. The coils are a set distance apart and move together laterally via mechanical ...
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560 views

Desktop PC power supply is Inductive or resistive loads?

Our daily computers (Desktop PC, Server or normal laptop, mobile chargers) are those power supply inductive or resistive loads?
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56 views

Can you pair a compass or magnetometer with an induction circuit to create a form of metal detector?

A compass or magnetometer by themselves can only detect/measure magnetic fields, and thus would normally only be able to detect ferrous metals and (possibly) some active electrical circuits in ...
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137 views

Simulation of Qi Communication Signal in LTSpice

I try to simulate the communication signal between transmitter and receiver in LTSpice (Wireless Charging Qi). For this I realized on the transmitter side a full bridge (Input 12V), which is operated ...
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1answer
57 views

How do inductive chargers detect a load?

For a wireless inductive charger, I understand the basic operating principle. I have a question regarding the operation of such chargers when no "load" is "connected". How do they detect the presence ...
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78 views

What specifies how much energy can be disspated in an IGBT when switching off?

I am driving an inductive load with an inductance \$L = 500\mu H\$ with a steady-state current of \$I = 300A\$. I would like to switch this current off quickly, and I plan on using an IGBT to do so. ...
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164 views

Effects of rapidly pulsing DC inductive load on solid state relays

I'd like to use some solid state relays to turn on and off a high voltage, low current DC inductive circuit (120-150VDC, 20-60ma). The SSR would only be switched on and off at a maximum of once every ...
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1answer
415 views

Driving inductive load from IC with MOSFET

I am designing a driver circuit to drive a hydraulic proportional valve from an IC's PWM output. (IC is ATmega 2560). The coils on the valve draw approx 3Amps at %100 duty cycle with a power supply of ...
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1answer
204 views

Triac misfires because of noise from inductive loads

The product is a wifi enabled smart switching device. One device has 4 different channel for four different appliances to be connected to the product. Each channel has a pair of optocoupler and triac ...
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2answers
641 views

Transistor as a switch, what does the inductor do?

I dont understand what the inductor in this circuit is actually doing. Is there a current flowing through the coil when my input is 0 ? If so, it should be DC so the coil isnt really doing anything ...
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127 views

What type of resistor component is this?

I have an RCA Victor 35x tube radio and I need to know what type of resistor this is and what it's purpose is? There is some wire wrapped around the resistor and it's attached to the antenna. ...
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52 views

Relay Max Inductive Current

I have a few of these(http://old.ghielectronics.com/downloads/man/20084141716341001RelayX1.pdf) and I was looking at the data sheet. It states that the max inductive load is 7amp(3 on form C). Does ...
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129 views

Can an analog inductive proximity sensor be used to discriminate between different types of metal (aluminum and steel)?

I am attempting to create a robot that will sort aluminum from steel automatically via an arduino. The code is essentially: if steel, do X, if aluminum, then do Y. I am using an analog inductive ...
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1answer
82 views

Short range wireless pulse transmission in wind anemometer

I have an old windmil-type anemometer, something like this: (Illustrative image, the real unit is 40+ year old soviet-made device with presumably no operational active components inside) My project ...
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1answer
242 views

Can I add flyback diodes to my car window motors?

I have an older car with a known issue with the window switches: they carry all the motor current, and after a while the contacts suffer carbon buildup presumably from flyback arcing. Commonly, owners ...
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99 views

Comparison of energy storage density of inductive and capacitive systems

In the paper A Review of Short Pulse Generator Technology by John Mankowski (IEEE Transactions on Plasma Science, Vol. 28, No. 1, 2000, pp 102-108) I found that "energy density of inductive storage ...
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1answer
284 views

triac controlled voltage preregulator (mains)

At present I am rebuilding an 1990 Elektor powersupply with a triac controlled preregulator able to handle inductive loads. My intention is to modernise the design but first I want it to be ...
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129 views

Reducing Inductive Kick when Switching Audio Transformer

I have a circuit where I'm switching the primary of an audio transformer using relay NO/NC contacts. A partial schematic is shown. The problem is that I'm getting inductive kick whenever the ...
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PIC32 intermittent resets - revisited

This is a follow-up on a previous question that I have asked before, after making some changes as suggested through valuable inputs by other members, but with the problem persisting. In a nutshell, ...
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2answers
450 views

Problem with mosfet in H-bridge

I am using 4 IRF840 N-channel mosfet,converting 325VDC to 230VAC with SPWM and H-bridge.I have no problem with resistive load,but when I connect inductive load or a device with capacitor power supply,...
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1answer
356 views

NPN driving PNP, Diode from NPN Base to PNP Collector?

I am reviewing some old 12V alarm designs that use the circuit below to activate a siren. The design has been built on PCB and I have confirmed proper operation, proving the schematic is not flawed (...
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1answer
93 views

device to make a power supply sparks safe [closed]

I have an original HP 19V power supply for my laptop. From The first time I bought it I always saw a spark on plug in the wall plug. I notice the same in many ATX power supply. The problem is that ...
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1answer
79 views

SSR fires from nearby relay

I am using a SPF240D25R Solid State Relays - PCB Mount PCB SIP 240VAC, 25A load current and 4-15VDC trigger voltage. This is being triggered from a ULN2003A and ...
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1answer
279 views

Charge battery with AC [closed]

EDIT: Question 1: what type of current will be created when passing magnets past a coil? AC or DC? Question 2: What is the best way of storing the electricity generated with a contactless dynamo? I'...
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1answer
77 views

Multiple wireless chargers in parallel or in series and what voltage/current

I am using an Adafruit Inductive Charging Set to charge a device with a 400mAh LiPo battery I have hooked up to a TP4056 LiPo charger. I can charge one device at a time from a variable power supply ...
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222 views

How realistic is this model for an inductive spike?

I want to model a real-life scenario when a mechanical switch is rapidly opened when passing current through an inductive load. Below is a model and corresponding plots for the switch control (Vn001), ...
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2answers
404 views

Switching inductive loads at long distances - best practice

This question focuses on the switching of inductive loads at a relatively long distance, specifically on handling the inductive kickback as a result of switching. The inductive load in question is an ...
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72 views

Is it a disadvantage for a generator to supply both resistive and reactive current to its load?

Suppose The power network 1 has a resistive load and therefore the current supplied by the generator 1 to the load is purely resistive. The power network 2 has a resistive + inductive load and ...